Used the JavaScript proxy support to lazy load configuration fragments in <l:hetero-list>

core/src/main/java/hudson/Functions.java

@@ -70,6 +70,7 @@ import hudson.scm.SCMDescriptor;
 import hudson.util.Secret;
 import hudson.views.MyViewsTabBar;
 import hudson.views.ViewsTabBar;
+import hudson.widgets.HeteroListConfigPageRenderer;
 import org.acegisecurity.providers.anonymous.AnonymousAuthenticationToken;
 import org.apache.commons.jelly.JellyContext;
 import org.apache.commons.jelly.JellyTagException;
@@ -1314,4 +1315,7 @@ public class Functions {
         return Boolean.getBoolean("hudson.security.ArtifactsPermission");
     }
 
+    public static String createHeteroListConfigPageRendererProxy(Object it) {
+        return Stapler.getCurrentRequest().createJavaScriptProxy(new HeteroListConfigPageRenderer(it));
+    }
 }